diff --git a/egui/src/widget_text.rs b/egui/src/widget_text.rs
index f2451d71..acd77878 100644
--- a/egui/src/widget_text.rs
+++ b/egui/src/widget_text.rs
@@ -9,7 +9,7 @@ use crate::{
 ///
 /// The style choices (font, color) are applied to the entire text.
 /// For more detailed control, use [`crate::text::LayoutJob`] instead.
-#[derive(Default)]
+#[derive(Clone, Default, PartialEq)]
 pub struct RichText {
     text: String,
     text_style: Option<TextStyle>,
@@ -555,6 +555,7 @@ impl From<Arc<Galley>> for WidgetText {
 
 // ----------------------------------------------------------------------------
 
+#[derive(Clone, PartialEq)]
 pub struct WidgetTextJob {
     pub job: LayoutJob,
     pub job_has_color: bool,
@@ -574,6 +575,7 @@ impl WidgetTextJob {
 // ----------------------------------------------------------------------------
 
 /// Text that has been layed out and ready to be painted.
+#[derive(Clone, PartialEq)]
 pub struct WidgetTextGalley {
     pub galley: Arc<Galley>,
     pub galley_has_color: bool,
diff --git a/epaint/src/texture_atlas.rs b/epaint/src/texture_atlas.rs
index 054a2c1c..a79501aa 100644
--- a/epaint/src/texture_atlas.rs
+++ b/epaint/src/texture_atlas.rs
@@ -6,7 +6,9 @@ pub struct FontImage {
     pub version: u64,
     pub width: usize,
     pub height: usize,
-    /// White color with the given alpha (linear space 0-255).
+    /// The alpha (linear space 0-255) of something white.
+    ///
+    /// One byte per pixel. Often you want to use [`Self::srgba_pixels`] instead.
     pub pixels: Vec<u8>,
 }
 
diff --git a/epi/src/lib.rs b/epi/src/lib.rs
index 7cd0bba2..b780b2eb 100644
--- a/epi/src/lib.rs
+++ b/epi/src/lib.rs
@@ -160,8 +160,13 @@ pub trait App {
     }
 
     /// The size limit of the web app canvas.
+    ///
+    /// By default the size if limited to 1024x2048.
+    ///
+    /// A larger canvas can lead to bad frame rates on some browsers on some platforms.
+    /// In particular, Firefox on Mac and Linux is really bad at handling large WebGL canvases:
+    /// <https://bugzilla.mozilla.org/show_bug.cgi?id=1010527#c0> (unfixed since 2014).
     fn max_size_points(&self) -> egui::Vec2 {
-        // Some browsers get slow with huge WebGL canvases, so we limit the size:
         egui::Vec2::new(1024.0, 2048.0)
     }